Lock



FeB. 19, 1935. N, B. HURD y1,992,126

LOCK

Filed April 5, 1929 INVENTOR UNITED STATES PATENT OFFICE LOCK Norman B. Hurd, New Britain, Conn., assigner to The American Hardware Corporation, New Britain, Conn., a corporation of Connecticut Application April 3, 1929, seal No. 352,115

' 7 (xmms. `(o1. zo- 91) My invention relates to a lock and more particularly to one of the type wherein the parts may be easily disassembled for changing the combination.

In locks on the doors vof oflices, apartment houses, and the like, wherein tenants often change, it is desirable to provide means for a quick change of the key combination of all locks. My invention is particularly adaptable'to locks of the type indicated, wherein the key combination is carried by the door knob, and the invention relates to certain details of construction whereby this combination may be readily removed and replaced by the same or a different combination. f

It is the principal object of the invention to provide a lock of the character indicated having improved, simple means whereby by means of a special key the knob may be removed and the combination changed.

It is a further object to provide an improved lock of the character indicated, simple in construction, relatively cheap to manufacture, of sturdy construction, and serviceable in use.

In the drawing which shows, for illustrative purposes only, a preferred form of the invention- Fig. 1 is a longitudinal central sectional View through a door knob and associated parts, and illustrating my invention, an ordinary pass key being shown in place;

Fig. 2 is a View similar to Fig. 1, parts being separated, and a special key in place;

Fig. 3 is a perspective view of certain operative parts shown in Figs. 1 and 2 and relatively separated. l

In said drawing, 5 indicates a rotatable hollow spindle to be attached to a lock casing attached to the door. port for said hollow spindle, said support being part of the lock case or escutcheon plate, not shown. Since the latch or lock mechanism carried by the door may be of any preferred construction and forms no part of the present invention, no illustration thereof is made. 6 indicates a hollow knob and arranged for detachable connection to the hollow spindle 5.

In the preferred form, the knob 6 carries a cylinder lock, the cylinder of which is non-rotatably held in the knob 6 as by means of the pin casing 8 in engagement with the walls of a slot of corresponding yshape in the rear of the door knob, as will be clear from Fig. 3. The lock casing 7, when parts are disassembled, is readily removable by drawing the same rearwardly out of the knob.` In the preferred form, the rear of the 5a is a stationary sleeve-like sup- Aplate or ring member 11 carrying one or more pins 12 to pass through correspondingly spaced apertures 13-13 in a flange 14 on thepart 10 and into correspondingly spaced apertures 15-15 in the rear face of the part 6. The member 10 is provided with means for engagement with the hollow spindle 5 and in the form shown I employ at the rear end of member 10 rearwardly extendv ing spacedapart circumferential lugs 16-16 between which forwardly extending lugs 17--17 on the hollow spindle 5 may t so as to couple the knob to the spindle 5 for rotation. The parts and 10 are held together against relative axialseparation by a key actuated means to be described.

In the form shown, the cylinder 7 contains a plug 20 having usual pin tumblers 21 which are adapted to be actuated by an ordinary pass key 22. It will be noted particularly in Fig. 1 that the last tumbler 23 is not engaged by the pass key 22. The plug 20 in the preferred form shown carries a sleeve 24 which is normally locked to the casing 7 by means of the driver 25 as will also be clear from Fig. 1. rIhe sleeve 24 extends rearwardly and carries one or more circumferential lugs 26.

`The parts 5--10 are provided with complementary abutment surfaces 28-28 so that when said parts are moved into longitudinal engagement with each other as shown in Fig. 1 the lugs 26 may engage wholly or vpartially between the complementary abutment surfaces 28-28 so as to lock the saidV members 5--10 and associated parts against longitudinal separation. The key plug 7 or a continuation thereof carries a spindle 30 for 'unlimited rotation by key 22 for actuating the latch or lock mechanism (not shown) In Fig. 1, parts are shown in the normal position, that is, with the members locked together. When it is desired to separate the parts so as to permit removal of the lock casing 'l to repair or change the combination, a special key 31, in this `case longer than the pass key 22, is inserted into be turned into the position shown in Fig. 2 and freed from the abutment surfaces 28-28 on the shank member 5. The knob 6 and the parts associated therewith as shown in Fig. 2 may then be drawn outwardly, that is, toward the left, and thereafter the knob may be opened up to permit changing the combination. This is efiected by first removing the cover plate 1l and withdrawing the locking pins 12-l2, after which the cover l0 may be unscrewed from the knob part 9 so that the cylinder lock may be withdrawn and a new lock combination made or substituted. Under normal conditions the part 24 and spindle 30 may partake of the limited rotation of the knob at any time but this limited rotation is not suicient to cause disengagement of the parts so that the knob may be withdrawn from the hollow spindle 5 nor need it be sufficient to cause spindle 30 to operate the part (not shown) designed to be operated thereby.

While the invention has been disclosed in considerable detail and one specic embodiment thereof illustrated, it is to be understood that various changes `in matters of detail may be made within the scope of the invention as defined in the appended claims.

I'claim: l. In a lock, a knob, a lock casing in said knob,

a shank member detachably connected to said knob, a second shank member for coaction with said first mentioned shank member, said shank members having interengaging parts for prevent- -ing relative rotation therebetween, Asaid shank members having abutment surfaces thereon, a plug carried by said lock casing, and key actuated lmeans rotatable with said plug and having means 'thereon for engagement with said abutment surfaces for preventing axial displacement of said 3. In a lock, a knob, lock mechanism within said knob, a member detachably secured to said knob for holding said lock mechanism in place, a member to be carried by a door, and means operable by a part of said lock mechanism for holding said two members together.

4. In a lock, a knobformed in two parts, means including a retaining member movable axially relatively to said knob for holding said knob parts together, lock mechanism within said knob, ra member to be secured to a door, and means operable by a partr of said lock mechanism for securing said knob to said member to be secured to a door and preventing axial movement of said retaining member.

5. In a lock, a knob, lock mechanism carried by said knob, means for retaining said lock mechanism in said knob and including a retaining member movable axially of said knob into retaining and. non-retaining position, an element to be secured to a door, and means operable by a part of said lock mechanism for holding said knob to said element and preventing axial movement of said retaining member.

6. In a lock, a knob, lock mechanism within. said knob, retaining means for securing said lock mechanism in saidV knob, a member to be secured to a door, and means operable by a part of said lock mechanism for securing said knob to said member and holding said retaining means in y place.

'7. In a lock, a knob member, a shank member removably secured to said knob member, ya lock mechanism between said knob and shank members, a shank member to be carried by adoor,

said shank members having axially engageable keying means for holding said shank members against relative rotation, said lock mechanism including a plug part having means for locking said shank members against axial separation, and

a second plug part rotatable relatively to said first mentioned plug part for the purpose described. 

